???.....exhaust....???

[GREASEMONKEY72]

first off i have a 72 custom/10 it has a stock 350sbc with a quadrajet 4barrel the exhaust is stock ramhorns with 26in glasspacks dauls with no crossover and it has a bubbley sound to it while idleing and if i rev it it has a bubbley sound when the rpms go back down but it didnt do this before i rebuilt the carb so im wondering if this is bad or what cause it sounds cool but is it bad or is it just an added sound and also how much better is a crossover for the performance and would it be worth putting one in thanks in advance for any and all advice

-steven